[PATCH v4 3/9] block: introduce bio_required_sector_alignment()
From: Satya Tangirala <hidden>
Date: 2021-07-07 05:30:09
Also in:
lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
From: Satya Tangirala <redacted> This function returns the required alignment for the number of sectors in a bio. In particular, the number of sectors passed to bio_split() must be aligned to this value. Signed-off-by: Satya Tangirala <redacted> --- block/blk.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/block/blk.h b/block/blk.h
index 4b885c0f6708..047d2c2411f2 100644
--- a/block/blk.h
+++ b/block/blk.h@@ -261,6 +261,23 @@ static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9; } +/* + * Return the number of sectors to which the size of the given bio (and any bios + * split from it) must be aligned. + * + * Normally this is just the disk's logical block size in sectors, but it may be + * greater if the bio has an encryption context. + */ +static inline unsigned int bio_required_sector_alignment(struct bio *bio) +{ + unsigned int alignmask = + (bdev_logical_block_size(bio->bi_bdev) >> SECTOR_SHIFT) - 1; + + alignmask |= blk_crypto_bio_sectors_alignment(bio) - 1; + + return alignmask + 1; +} + /* * The max bio size which is aligned to q->limits.discard_granularity. This * is a hint to split large discard bio in generic block layer, then if device
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2.25.1